The RPC-based IFR system at BaBar experiment: preliminary results Piccolo, Davide; Palano, A; Bagnasco, S ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2002, Letnik:
477, Številka:
1
Journal Article
Recenzirano
The IFR system is a RPC-based detector used to identify muons and neutral hadrons in the BaBar experiment at PEP II machine in SLAC. The RPC system can be used to reconstruct the trajectory of muons, ...pions and neutral hadrons interacting in the iron of the IFR. The different range and hit pattern allow to discriminate different particles crossing the IFR.
An overview of the system design and the preliminary results on the IFR performances are reported.
Resistive Plate Chambers have been chosen as active elements for the μ and K
l
detector in the BaBar experiment. This subsystem, now under construction, represents the most extensive use to date of ...the RPC technology. The design considerations are presented, together with preliminary results on the operating characteristics.
The muon and neutral hadron detector for BaBar Anulli, F.; Asmone, A.; Baldini Ferroli, R. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/1998, Letnik:
409, Številka:
1-3
Journal Article
Recenzirano
The muon and neutral hadron detector of the BaBar experiment for the PEP-II Asymmetric B-factory at SLAC uses Resistive Plate Counters (RPCs) as active detectors. A large fraction of the total ...system, which consists of approximately 800 chambers for an overall surface of 2000m2, has already been built and tested in cosmic rays. Preliminary results of the operating characteristics with a new non-flammable and environmentally safe gas mixture are reported.
Performances of RPCs in the BaBar experiment Anulli, F.; Baldini, R.; Band, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2003, Letnik:
515, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The BaBar experiment uses a big system based on RPC detectors to discriminate muons from pions and to identify neutral hadrons. About
2000
m
2
of RPC chambers have been working at SLAC since the end ...of 1998. We report on the performances of the RPC chambers focusing on new problems discovered in the RPC behaviour. These problems started very soon after the installation of the chambers on the detector when the high-ambient temperature triggered an increase of dark currents inside the chambers and a reduction of the efficiency. Careful analysis of the BaBar data and dedicated R&D efforts in the laboratory have helped to identify the main source of the trouble in the linseed oil varnish on the bakelite electrodes.
The BaBar instrumented flux return performance: lessons learned Anulli, F; Bagnasco, S; Baldini, R ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2002, Letnik:
494, Številka:
1
Journal Article
Recenzirano
The BaBar Collaboration has operated an instrumented flux return (IFR) system covering over
2000
m
2
with resistive plate chambers (RPCs) for nearly 3 years. The chambers are constructed of bakelite ...sheets separated by
2
mm
. The inner surfaces are coated with linseed oil. This system provides muon and neutral hadron detection for BaBar. Installation and commissioning were completed in 1998, and operation began mid-year 1999. While initial performance of the system reached design, over time, a significant fraction of the RPCs demonstrated significant degradation, marked by increased currents and reduced efficiency. A coordinated effort of investigations have identified many of the elements responsible for the degradation. This article presents our current understanding of the aging process of the BaBar RPCs along with the action plan to combat performance degradation of the IFR system.
We have searched for signatures of polarization in hadronic jets from ital Zsup 0r arrowital qbar q decays using the jet handedness'' method. The polar angle asymmetry induced by the high SLAC Linear ...Collider electron-beam polarization was used to separate quark jets from antiquark jets, expected to be left and right polarized, respectively. We find no evidence for jet handedness in our global sample or in a sample of light quark jets, and we set upper limits at the 95% C.L. of 0.063 and 0.099, respectively, on the magnitude of the analyzing power of the method proposed by Efremov ital et ital al.
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